I just got a few (3-4) male flowers off of my autoflowering blueberry kush after letting it sit for about 2 weeks after harvest. Don't know whether the pollen is viable or not yet.
Only let the bottom set of buds stay to Rodelize - harvested rest of plant. It's still smokeable weed too, though naturally not as good as the rest hehe.
Of course only taking the cola to begin with and leaving the rest to rodelize would produce more male flowers than what I got...